This! What Ed says. Loaded, you'll really want that extra spin! I'm using your exact proposed setup; 40t loaded up front and frame bag. Doesn't even have to be a 30% hill to use the lowest ratio.
I really wanted that extra boost on long, mildly slopey, but scree like terrain. Ultra low gearing gives extra control when you don't want to get off every 15 minutes to hike a bike.
I was riding up measly 12% grades on the road on my 30/36 yesterday which is 22GI. And in 46/11 on every descent. Perfect for me. Only had about a kilo of junk on the bike. Much nicer spinning up them at 90RPM, didn't have to get out of my saddle at all unless I wanted to.
This! What Ed says. Loaded, you'll really want that extra spin! I'm using your exact proposed setup; 40t loaded up front and frame bag. Doesn't even have to be a 30% hill to use the lowest ratio.
I really wanted that extra boost on long, mildly slopey, but scree like terrain. Ultra low gearing gives extra control when you don't want to get off every 15 minutes to hike a bike.